By Mallory Simon and Jason Hanna
CNN

Some publicly known details of the September 11 killings of four Americans in Benghazi, Libya, including U.S. Ambassador to Libya Chris Stevens, have changed in the weeks since the attack.

U.S. officials initially said the attack on the U.S. Consulate in Benghazi and a nearby U.S. annex came as protesters outside the consulate rallied against an online video that unflatteringly portrays Islam's Prophet Mohammed. That explanation seems to have shifted as investigations progressed.

The following is the latest information that CNN has gleaned about the attack, and some unanswered questions.
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